68 Cal Projectile (not a Tampon)

Conical inside to make it front heavy and a 33.5 degree twist to support it in flight.

Outer-Ø 17.2mm might need a little adjustment depending on your printer settings.

Weight can be adjusted by changing the infill.

25% infill with 4 outer walls equals 3.5g or 54 grains total

Has a great range and appears to fly without tumbling. 

More versions in the works.

Dont aim at anything/ anyone.